Low power high efficiency switching power supply

Details Low power high efficiency switching power supply Low power high efficiency switching power supply

1985-08-13

1987-05-26

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

323266, 323226, H02M 3335

Patent

active

046690387

ABSTRACT:
A low power high efficiency switching power supply comprises a switching transducer having primary and secondary windings. The primary winding is supplied with a primary voltage over a series connected constant current source and Zener diode. The primary voltage is chopped by an FET which has a gate connected to an oscillator operating at relatively low frequency. The secondary windings of the transformer are connected to full-wave rectifiers which convert the A.C. signal produced by the chopping of the primary voltage, int a D.C. signal. Efficiency is maximized by using fast switching FET's and low flux densities in the transformer. The power supply is particularly useful in 4-20 mA current loops.

REFERENCES:
patent: 4025862 (1977-05-01), Gautheron
patent: 4502104 (1985-02-01), Mitchell

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